Validating primary subsets of received sensor data using computer cryptographic processing

ABSTRACT

A computer identifies capture device output that represents an aspect of a recorded event. The computer cryptographically processes the primary subsets of capture device output to produce a validatable master file which includes master file media data primary subset from the capture device output, master primary subset metadata of the master file media data primary subset, and master file blocktree data. The master file blocktree data includes a master file block history portion, a master file signature key portion, and a signed hash of the master file media data primary subset. The computer also modifies the master file media data primary subset to produce a reference file media data primary subset. reference files and distributable files. The computer verifies the authenticity of each of these files.

BACKGROUND

The present invention relates generally to the field of media capture, and more specifically, to verifying authenticity of originally-captured media files.

Data may be obtained from sensors in a variety of capture devices, such as a photographic cameras, audio capture devices, infrared video capture devices, radar spatial information capture devices, sonar spatial information capture devices, lidar spatial information capture devices, laser “trip-wires,” chemical signature information capture devices, X-ray image capture devices, microwave image capture devices, barometric pressure reading capture devices, anemometer, etc. In some cases, is important to be able to verify that stored data captured by one or more of these devices authentically represents what was captured by the device.

SUMMARY

Aspects of the present disclosure recognize and address the shortcomings and problems associated with confirming the authenticity of primary subsets of as-recorded media files. Other aspects of the invention allow primary subsets of an original media file to be identified as important data subsets and allow the nature of changes made to those portions to be validated. Other embodiments of the invention assess the veracity of files supposedly based on changes made to verifiable, as-recorded media files. It is noted that the as-recorded media files may include secondary subsets, as well as primary subsets. By selecting certain aspects of media files to validate, aspects of the present invention provide customized file assessment, allowing end users to select of portions (e.g., primary subsets, including foreground layers within visual and audio files, or other aspects selected by one skilled in this field) of media in which it is preferable to have on only minimal (or no) changes and portions, (e.g., secondary subsets, including background layers within visual and audio files, or other aspects selected by one skilled in this field) of media in which relatively more changes will be tolerated.

In an embodiment, a computer-implemented method includes: receiving, by a computer, a capture device output, the output representing an aspect of a recorded event. The computer cryptographically processes the capture device output to produce a validatable master file, the master file including at least one primary subset. The validatable master file includes a master file media data primary subset from the capture device output, master metadata, and master file blocktree data; The master file blocktree data includes a master file block history portion, a master file signature key portion, and a signed hash of the master file media data primary subset. According to aspects of the invention, the cryptographic processing includes dividing the media data, by the computer, into at least one tracked data subset corresponding to the primary subset. The computer generates a hash of the at least one tracked data subset. The computer generates metadata of the hash of the at least one tracked data subset. The computer combines the hash and the metadata of the hash into at least one tracked data packet. The computer cryptographically signs the at least one data packet. According to aspects of the invention, the computer modifies the master file media data primary subset to produce a reference file media data primary subset. According to aspects of the invention the computer prepares a reference file including the reference file media data primary subset, reference file metadata, and reference file blocktree data. The reference file blocktree data includes the master file blocktree data and blocktree incrementing information. The blocktree incrementing information includes a hash of the master file blocktree data, reference file blocktree metadata, a signed hash of primary subset metadata, a signed hash of a change log incrementing the media data primary subset from the master file media data primary subset, and a signed hash of the reference file media data primary subset. According to aspects of the invention, the computer the reference file further includes instructions indicating replicable changes made, by the computer, between the modified primary subset media and the master file media data primary subset. According to aspects of the invention, the computer receives a challenged master file identified as a copy of the validatable master file. The computer receives a request to validate the challenged master file. The computer executes a master file validation routine to assess validity of the challenged master file. The master file validation routine includes hashing, by the computer, media data primary subset of the challenged master file to generate a hashed challenged master file media data primary subset. The computer unsigns a signed hash portion of the media data primary subset of the challenged master file to generate an unsigned challenged master file media data primary subset. The computer determines whether the hashed challenged master file media data primary subset and the unsigned challenged master file media data primary subset match. According to aspects of the invention, the computer receives receiving, by the computer, a reference file identified as a modified version of the master file. The computer receives a request to determine whether the reference file is a modified version of the master file. The computer executes a reference file verification routine. The reference file verification routine includes determining, by the computer, whether the hash of the master file blocktree data and a hash of blocktree data of the reference file match. The computer applies changes indicated by the blocktree incrementing information to a media data primary subset in the reference file to generate a hashed reference file media data primary subset and unsigning reference file blocktree data to generate unsigned reference file blocktree data. The computer determines whether the hashed reference file media data primary subset and the unsigned reference file blocktree data match. According to aspects of the invention, the computer receives a reference file identified as an authentic modification of the master file. The computer receives a distributable file. The computer receives a request to determine whether the distributable file is an authentic modification of the reference file identified as an authentic modification of the master file. The computer executes a distributable file verification routine. The distributable file verification routine includes determining whether a hash of distributable file blocktree data matches a hash of the reference file blocktree data and whether a hash of a distributable file media data primary subset matches a corresponding unsigned hash of a representative media block.

In another embodiment of the invention, a system includes A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to: receive, using the computer, a capture device output, the output representing an aspect of a recorded event; cryptographically process, using the computer, the capture device output to produce a validatable master file, the master file including at least one primary subset; wherein the validatable master file includes a master file media data primary subset from the capture device output, master metadata, and master file blocktree data; wherein the master file blocktree data includes a master file block history portion, a master file signature key portion, and a signed hash of the master file media data primary subset.

In another embodiment of the invention, a computer program product comprises computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to: receive a capture device output, the output representing an aspect of a recorded event; cryptographically process the capture device output to produce a validatable master file; wherein the validatable master file includes a media data primary subset from the capture device output, master primary subset metadata of the master file media data primary subset, and master file blocktree data; wherein the master file blocktree data includes a master file block history portion, a master file signature key portion, and a master file primary subset signed data hash.

Some issues with confirming authenticity of data files include difficulty in determining whether a given file in fact contains a true copy of selected portions of the as-recorded data from a capture device. Other problems can include determining whether instructions in a change log are true representations of changes that have occurred to primary subsets of a file containing a modified version of captured data. Other problems occur when trying to validate the authenticity of portions of various versions of files (e.g., reference files and distribution files) which are not duplicates of a master file but which, instead, supposedly contain verifiable variations of primary subsets of the master file.

Aspects of the present invention enables a computer to replicate changes made to an original media file to get resulting composite media files (e.g., with primary and secondary aspects) and validate whether selected portions (e.g., primary and/or secondary aspects) of the resulting composite file are identical to representations of those aspects as present in a composite file whose integrity is being challenged.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects, features and advantages of the present invention will become apparent from the following detailed description of illustrative embodiments thereof, which is to be read in connection with the accompanying drawings. The various features of the drawings are not to scale as the illustrations are for clarity in facilitating one skilled in the art in understanding the invention in conjunction with the detailed description. The drawings are set forth below.

FIG. 1 is a schematic block diagram illustrating an overview of a system for computer-implemented generation of a validatable master file media data primary subset.

FIG. 2 is a flowchart illustrating a method, implemented using the system shown in FIG. 1 , of capturing media data and storing an associated master file.

FIG. 3 is an exemplary format of a master file having primary subsets according to aspects of the invention.

FIG. 4 is a flowchart illustrating a method, implemented using the system shown in FIG. 1 , of modifying a master file to generate primary subsets of a reference file according to aspects of the invention.

FIG. 5 is an exemplary format of a reference file having primary subsets according to aspects of the invention.

FIG. 6 is a flowchart illustrating a method, implemented using the system shown in FIG. 1 , of validating a master file having primary subsets according to aspects of the invention.

FIG. 7 is a flowchart illustrating a method, implemented using the system shown in FIG. 1 , of validating primary subsets of a reference file according to aspects of the invention.

FIG. 8 is a flowchart illustrating a method, implemented using the system shown in FIG. 1 , of validating a primary subsets of distributable file according to aspects of the invention.

FIG. 9A is a schematic representation of an exemplary file containing an internal blocktree according to aspects of the invention.

FIG. 9B is a schematic representation of aspects of an exemplary block structure according to aspects of the invention.

FIG. 10A is a schematic representation of aspects of an exemplary media file containing a blocktree in a media file according to aspects of the invention.

FIG. 10B is a schematic representation of aspects of an exemplary media file containing a blocktree having a single branch of dependencies.

FIG. 10C is a schematic representation of aspects of an exemplary media file containing a blocktree having various dependencies.

FIG. 11 is a schematic block diagram depicting a computer system according to an embodiment of the disclosure which may be incorporated, all or in part, in one or more computers or devices shown in FIG. 1 , and cooperates with the systems and methods shown in FIG. 1 .

FIG. 12 depicts a cloud computing environment according to an embodiment of the present invention.

FIG. 13 depicts abstraction model layers according to an embodiment of the present invention.

DETAILED DESCRIPTION

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a participant” includes reference to one or more of such participants unless the context clearly dictates otherwise.

Now with combined reference to the Figures generally and with particular reference to FIG. 1 and FIG. 2 , an overview of method 200 for confirming the authenticity of primary subsets of as-recorded media files, the nature of changes made to primary subsets of as-recorded media files, and the veracity of files supposedly based on the verifiable changes made to primary subsets of as-recorded media files. Method 200 is usable within a system 100 as carried out by a server computer 120 having optionally shared storage 122 and aspects 124 (including a signal processing chip 126, a cryptographic processing chip 128, ROM 130, and a general processing chip 132 that cooperatively confirm the authenticity of primary subsets of as-recorded media files, indicate the nature of changes made to primary subsets of as-recorded media files, and demonstrate the veracity of files supposedly based on the verifiable changes made to primary subsets of as-recorded media files. It is noted that the storage 122 could, within the spirit of aspects of this invention, take a variety of forms, including a receiving bus, an I/O bus, a networking card, or other items capable of receiving file data such as a master file 300, or a reference file 500.

It is noted that the method of the current invention is expected to be used by participant groups (e.g., professional organizations, corporate entities, etc.), individuals, and computerized programs such as Application Programming Interface (API) that have appropriate rights to capture the data described herein, as well as the right to use and process the captured data in the ways described. It is also envisioned that any models whose likeness is captured or used in accordance with aspects of the present invention have provided valid consent for such capture and use. The data described herein is captured and used in accordance with legally-appropriate methods and with all consent necessary for the intended uses.

According to aspects of the invention, a capture device with a sensor 136 records an aspect of reality 134, such as an image, a sound, a pressure reading, etc. and passes the aspect along to a signal processing chip 126 associated with a server computer 120. The capture device sensor sends raw data to the signal processing chip 126, where system 100 converts the raw data into a format useable by the system 100 and optionally compressed. If the signal processing chip 126 does not compress the data, an optional compression chip (not shown) may be used. The cryptographic processing chip 128 takes the processed (and possibly compressed) data, divides the data into predetermined subsets (such as pixels or other discrete units associated with the data being processed), and hashes the subsets. According to aspects of the invention, at least one of the subsets to be hashed corresponds with a primary subset of the media data. It is noted that all or substantially all file subsets may be deemed primary subsets (e.g., as in scenarios for which no (or only minimal) changes are tolerated). Using the hashes of the subsets (including the subsets corresponding to primary subsets), the cryptographic processing chip 128 adds primary subset metadata for each hash (e.g., the subset, timestamp, etc.) and cryptographically signs the primary subset hash data packets (i.e., hashes with respective primary subset metadata) with an immutable, unique private key held in the ROM 130. The signed primary subset data hashes and media data are passed to the general processing chip 132, which combines the signed primary subset data hashes and media data, along with any relevant metadata, into a master file 300 having the format shown in FIG. 3 . According to aspects of the invention, the master file blocktree data 310 includes a master file block history portion 311A, a master file signature key portion 314A, and a master file primary subset signed data hash 316A. It is noted that certain portions of the master file block history may be null or include other agreed upon content reflecting the original, non-changed nature of the master file 300. Aspects of the present invention enable tracked generation and distribution of media where multiple portions (e.g., primary portions and secondary portions) of the media have different traceable histories that can be validated as truthful modifications from a copy of the original media file. Aspects of the invention validate individual histories of various portions (e.g., different layers, etc.) of a media file as containing authentic, tolerable modifications (e.g., no changes allowed for primary subsets of media data, while modifications to secondary subsets are tolerated or other arrangements selected in accordance with the judgment of one skilled in this field) to an associated original media file.

With additional reference to FIG. 2 , the server computer 120, at block 202 receives sensor data from capture device 136; the sensor data is converted into media data (including a portion of media data which is tracked) that is cryptographically processed in block 206. With continued reference to FIG. 2 , the cryptographic processing includes dividing media data, at block 208, into subsets (with at least one of the subsets corresponding to the media data primary subset) and hashing the subsets at block 211. It is noted that the identification of primary subsets may be accomplished by an end user selection, by the server computer 120 in accordance with preferences established in a computer-implemented selection algorithm, or in any other manner chosen by one of known skill in this art. At block 212, the cryptographic processing chip 128 combines the hashed media data primary subset with primary subset metadata (which may, itself, be hashed) into hashed primary subset data packets. At block 214, the cryptographic processing chip 128 cryptographically signs the primary subset hashed data packets. The general processing chip 132 generates a master file 300 at block 216, and the server computer 120 stores the master file in shared storage 122 at block 218.

With reference to FIG. 3 , the format of a master file 300 according to aspects of this invention is shown; the format, according to embodiments of this invention, includes three portions: metadata 301, sensor media data primary subset 302, and internal blocktree data 310. In particular, the master file 300 shown in FIG. 3 is a file with only one block of blocktree data 311A, and this single block is known as a genesis block. The file format may be implemented as an extension to existing file formats. It is noted that while FIG. 3 shows master file 300, the system 100 generates other files (known as reference files 500, which are shown schematically in FIG. 1 and in more detail in FIG. 5 ) when modifying a master file 300 according to aspects of this invention, reference files have the same overall format (as shown in FIG. 5 , discussed in more detail below).

The internal blocktree data 310 includes blocks of information about the file and versions of its media data (and optionally, metadata) held in blocks that are cryptographically linked by including the cryptographic hash of the previous block, which corresponds to a previous version of the primary subset data (and optionally, primary subset metadata) of the master file 300 and a reference file 500.

It is noted that the media data primary subset 302 of the master file 300 represents original media data captured by a sensor in capture device 136, and the blocktree data 310, according to aspects of this invention, is a non-distributed blocktree (i.e., a data structure where each data block contains the cryptographic hash of the previous block) that is internal to a master file 300.

The blocktree data 310 contains a hashable portion and optionally (depending on the file variant) certain extensions that are not included in the block hash. The hashable portion includes the previous block hash 313A, 513B, etc. (or, for the genesis block, some agreed upon choice, such as null), the public key used in signatures for this block (optionally, any metadata about the public key), a hash (or root hash) of the changes made from the previous data version to get to this version (or, in the case of the genesis block, some agreed upon choice, such as null), and a signed hash of the current media data primary subset 302 in one of two formats. The first signed hash format includes a signed hash of the file metadata for this version (or its hash) and the file media data primary subset for this version (or its hash/root hash); the second signed hash format includes a signed hash of the file media data primary subset for this version, and (optionally) a signed hash of the file metadata for this version. It is noted that the master file 300 (a file with an internal blocktree that only has one block) has blocktree data divided into subsections as follows: general file metadata 301, media data (original from sensor) primary subset 302, internal blocktree data (for only one block) 310, the origin/genesis block 311A, hashable portion 312A of the origin/genesis block, previous block hash (in this case, null or some other predefined convention) 313A, public key used in digital signatures optionally including metadata about the public key 314A, other block metadata 315A, either (a) signed hash of the file metadata (or its hash) and the file media data primary subset (or its hash/root hash); or (b) signed hash of the file metadata and a signed hash of file (or root hash) of the file media data primary subset 316A. The master file 300 also includes signed hashes 317A of primary subsets metadata 322A. The master file 300, at block 318A contains signed hashes of prescriptive instructions contained in change logs 320A. It is noted that for the master file 300, block 318A may be null or some other value agreed to represent the nature of the master file as unchanged.

In addition to the structure described above, there are three optional file extension portions 320A, 321A, & 322A included in block 319A that may be included within aspects of this invention. The first extension is a change log 320A of some format that enables replicating the changes on the previous version of the media data primary subset to get to the current version of the media data primary subset. The change log 320 includes information iteratively documenting the changes made occurring to the media data 302. For each iteration beyond the master file 300, the change log 320 includes associated information which represents changes to the media data 302 in that iteration. It is noted that for the master file 300 itself, the change log 320 will preferably hold a null set value. The change log is only required for reference media file copies. The change log is optional, but not necessary for distributable copies. The second extension 321A is a copy of the media data primary subset at that stage of the history of the media file. It is not required for any of the file variants, and simply may be value added. The third extension 322A is primary subset metadata that indicates which portions of the media data are the primary subsets.

With reference to FIG. 4 , a method 400 to create a modified version 500 (also known as a reference file) of the master file 300 is shown. As noted above, a reference file 500 according to aspects of this invention is a modified version of the original, master file 300 generated according to the flow logic shown in FIG. 4 . At block 404, the server computer 120 receives a copy of the master file 300 (including primary subsets of the master file data), and at block 406, the server computer 120 modifies the master file media data 302 using, for example, an image or sound editing algorithm (not shown). After modifying the master media data 302, the server computer 120 receives, at block 408, a file containing the metadata 501, altered master media data primary subset 502 (as seen in FIG. 5 and described in detail below).

More particularly, the server computer 120 saves the altered media data, at block 410, as reference file media data primary subset 502. The server computer 120, at block 412, generates reference file metadata 501; at block 414, the server computer 120 combines reference file media data primary subset 502, reference file metadata 501, and reference file blocktree data 510 into a reference file data packet. As used herein, the term blocktree refers to a traditional blocktree, a hashchain, cryptographically linked list, or other immutable data structure that replicates the functionality and data integrity that a blocktree provides. At block 416, server computer 120 cryptographically signs the reference file data packets. At block 418, the server computer 120 generates reference file blocktree data 510 and updates the blocktree by adding the currently-iterated reference blocktree data 302 x to the existing blocktree. At block 420, the server computer 120 generates a reference file 500 containing the signed data packets 516 and saves the reference file blocktree data 510 at block 422.

As shown with reference to FIG. 5 , the reference file blocktree data 510 contains information about the file and versions of its data (and optionally, metadata) held in blocks that are cryptographically linked by including the cryptographic hash of the previous block, which corresponds to a previous version of the data (and optionally, metadata) of the file. Additional detail about a preferred structure for the reference file according to aspects of the invention is now provided with particular reference to FIG. 5 . A reference file with an internal blocktree that has multiple blocks is shown at 500; this file represents primary subsets of media that has been modified since its original creation. The reference file includes general reference file metadata 501, reference file media data (modified from original) primary subset 502, and internal blocktree data 510. The internal blocktree data 510 includes a series of blocks, including 511A (the genesis block associated with the master file 300), 511B (the modified block associated with the first reference file (i.e., a first round of changes to the master file 300)), and 511 x (a second or later reference block associated with possibly several rounds of changes to the original master file 300). Each block in the chain is further divided as described above into subsections, and the subsections are labelled as according to a numerical series (i.e., 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, and 522). As each round of media data changes take place, the server computer 120 generates a new reference file 500 and associated blocktree data, with each block in the chain maintaining the same relative format. For convenience, numerical references among the reference file blocktree subsections follow the same numerical arrangement (e.g., 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, and 522), with each generation of subsections having an indexed letter suffix (starting at “B”) appended thereto. This is schematically shown in FIG. 5 as 511B, 512B, 513B, 514B, 515B, 516B, 517B, 518B, 519B, 520B, 521B, and 522B and 511 x, 512 x, 513 x, 514 x, 515 x, 516 x, 517 x, 518 x, 519 x, 520 x, 521 x, and 522 x. If more than twenty-six generations of changes occur, (e.g., at the end of a run through the alphabet), an additional suffix letter, starting with A is added (e.g., a second run through the alphabet would begin with BA, BB, and so on). It is noted that suffix letter “A” is reserved for data associated with the original, master file 300 and used to identify the genesis/origin block generated for the master file.

With continued reference to FIG. 5 , the reference blocktree data 510 also contains a hashable portion 512 x which includes the previous block hash 513 x, a public key 514 x, and other block metadata 515 x, with any relevant metadata, and either option version of the signed, hashed media data described above. The public key 514 x represents the algorithm making the modifications, as either the public key corresponding to a generic private key shared by all algorithms of the same version or a public key corresponding to a private key that is unique to that algorithm installation.

The server computer 120 attaches three extensions to the blocktree data 510 x. The first extension, 520 x, is a change log of some format that enables replicating the changes on the previous version of the media data primary subset to get to the current version of the media data primary subset. As noted above, the change log 520 x includes information iteratively documenting the changes made occurring to the reference file media data primary subset 502. For each iteration beyond the master file 500, the change log 520 x includes associated information which represents changes to the reference file media data primary subset 502 in that iteration. The change log 520 x is only required for reference media file copies. The change log 520 x is optional, but not necessary for distributable copies. The second extension, 522 x, is primary subset metadata which describes what subsets of the reference file media data primary subset 502 are considered important and for which changes are to be tracked. The third extension, 521 x, is a copy of the reference file media data primary subset 502 (or only the media data primary subset) at that stage of the history of the media file. It is not required for any of the file variants, and simply may be value added.

The blocktree also includes a hashable portion of the block 512 x, a previous block hash (in the case of block A, the genesis block, this value is null or some other predefined convention) 513 x, a public key used in digital signature, that may include metadata about the public key 514 x, and other block metadata 515 x. Block 516 x includes a signed, hash of media data primary subset and possibly metadata. There are two preferred formats for this information: (a) signed hash of the file metadata (or its root hash) and the file media data primary subset (or its hash/root hash), or (b) signed hash of the file metadata and a signed hash (or root hash) of the file media data primary subset. Other formats for this signed, hashed information may also be selected according to the preferences of one skilled in this art. Block 517 x contains a signed hash of primary subset metadata, and block 518 x is a signed hash (or signed root hash) of block incrementing instructions 520 x. It is noted that instructions and the associated hash may only be present as a null value in block A, the genesis block, as no changes from the master file will have occurred. Block 519 x is a “block extension”, and this is information held in reference media files which is not required in (but not restricted from) distributable media files, and it is preferably not included in the block hash. Block 520 x contains prescriptive, replicable instructions detailing how to get from the version of the media data represented by the previous block to the version of the media data represented by this block (present as a null in block A because, as noted elsewhere, block A represents the original, master file version of the media that came from the sensor of the capture device 136). Block 521 x contains an optional, redundant copy of media data (or only the media data primary subset) at this point in the history of the media, and 522 x contains primary subset metadata which describes what subsets of the media data are considered important and for which changes are to be tracked.

With reference to FIG. 6 , a process for validating a master file 300 according to aspects of the present invention will now be described. At block 604, the server computer 120 receives a challenged master file (hereafter, “CMF”) which is to be validated. At block 606, the server computer 120 hashes CMF primary subset data and CMF primary subset metadata to generate first CMF comparison elements including unsigned hashes of CMF media data primary subset and CMF primary subset metadata. At block 608, the server computer 120 unsigns the signed hash of the CMF media data primary subset and signed CMF primary subset metadata from the CMF master blocktree data to generate second CMF comparison elements including unsigned signed hash of the CMF media data primary subset and signed CMF primary subset metadata. At block 610, the server computer 120 compares the first CMF comparison elements to the second CMF comparison elements and determines at block 612 whether those files match. If the first CMF comparison elements and second CMF comparison elements match, then the server computer 120 deems the CMF at block 614 to be an authentic copy of the original reference file 300. However, if the first CMF comparison elements and second CMF comparison elements do not match, the server computer 120 does not confirm the authenticity of the CMF, and the server computer deems the CMF to be inauthentic at block 616.

It is noted that according to aspects of the present invention, an assumption is made that the public key of the origin block is valid (i.e., representing of the sensor device that supplied it), and the capture device 130 that supplied the public key is trusted (this includes that the sensor of the capture device 136 has not been tampered with since the public key was embedded into the master media file). Verifying that sensor of the capture device 136 is trusted may be done in a variety of ways that may or may not involve the application validating the original media file.

With reference to FIG. 7 , a process 700 for validating a reference file 500 according to aspects of the present invention will now be described. At block 704, the server computer 120 receives a reference file 500 which is to be compared with a master file 300 for authentication (e.g., whether the reference file content represents content that has been modified from the master file content in accordance with instructions provided with reference file). At block 706, the server computer 120 compare reference file 500 genesis block hashes to master file 300 genesis block hashes, and at block 708, the server computer determines whether the compared genesis block hashes match. If the compared genesis block hashes do not match, the reference file may not be authentic, and the computer moves to block 718.

If the compared genesis block hashes do match, then the computer moves to block 710 and applies changes provided in reference file blocktree incrementing information to master file media data primary subset and hashes the results to generate first reference file comparison elements. At block 712, the server computer 120 unsigns the signed hashes in RF blocktree data to generate second RF comparison elements. It is noted that the first reference file comparison elements include hashed reference file media data primary subset or other elements selected in accordance with judgement used by one skilled in the art. It is noted that the second reference file includes unsigned reference file blocktree data or other elements selected in accordance with judgement used by one skilled in the art. At block 714, the server computer 120 determines whether the first reference file comparison elements and second reference file comparison elements match. If the reference file comparison elements match, the server computer 120 moves to block 716 and verifies the authenticity of the reference file 300. If the reference file comparison elements do not match, the validity of the reference file is not confirmed, and the computer moves to block 718, in which the computer does not verify the authenticity of the reference file 300, and the reference file may be labeled as inauthentic.

Now with reference to FIG. 8 , a method of validating a distributable file according aspects of this invention will now be described. At block 804, the compute receives a distributable file (hereafter, “DF”) and a verified authentic reference file (hereafter, “VARF”) to determine whether the DF, which is claimed to be an authentic derivative or other modification of the VARF, is actually a file containing an authentic version of media data contained in the VARF. At block 806, the computer compares hashes of DF blocktree data to hashes of VARF blocktree data, and at block 808 determines whether the compared hashes of blocktree data match. It is noted that the DF follows the same file format as the VARF without requirement for containing blocks 519 x and blocks included therein. If the compared hashes of blocktree data do not match, the distributable file may not be authentic, and the server computer 120 moves to block 816.

If the compared hashes of blocktree data do match, then the computer moves to block 810 and compares at block 812 the hash of the DF primary subset media file to a corresponding unsigned hash of a representative media block. In one in embodiment, the corresponding unsigned hash is the unsigned signed hash 516 x in the representative media block x, and the representative media block x is the block that represents the media data primary subset in block 502 at the associated iteration in the blocktree history. If the hashes of the DF primary subset media file and the hash in last DF blocktree block match, then the DF is deemed to be authentic. At block 814, the computer verifies the authenticity of the DF.

Now with reference to FIG. 9A, an exemplary file 900 with an internal blocktree structure will be described. According to aspects of the invention, the file 900 contains general file metadata portion 902, a media data portion 904, and an internal blocktree 906. In an embodiment, the blocktree 906 is an arrangement of data blocks in which each data block contains the cryptographic hash of at least one previous block from one or more prior branches. According to aspects of the invention, the blocktree 906 is an internal (e.g., stored locally) blocktree located within the exemplary file 900.

Now with reference to FIG. 9B, aspects of an exemplary block structure 908 will be described. The block structure 908 includes hashable portion of the block 910. The hashable portion of the block 910 includes previous block hash(es) 912 which, according to aspects of the invention, may be a null or some other predefined convention for an original media file. According to aspects of the invention, the previous block hash 912 may be a single block hash if there is only one immediate predecessor for current block. According to aspects of the invention, when multiple immediate predecessors exist, the previous block hash 912 includes the hash of each immediate predecessor block. The hashable portion of the block 910 includes public key 914 used in digital signatures which, according to aspects of the invention; may include metadata about the public key. The hashable portion of the block 910 includes other block metadata 916, signed hashes of the important subsets of the media data and optionally metadata 918, and signed hash of the important subsets metadata 920. The hashable portion of the block 910 includes a signed hash (possibly root hash) of instruction block 930 which, according to aspects of the invention, may be a null or some other predefined convention in an origin block, as no changes have occurred. The block structure 908 includes block extension 924. According to aspects of the invention, block extension 924 is present in reference media files, is not required in (but not restricted from) distributable media files, and is not typically included in the block hash. In an embodiment the block extension 924 includes a copy of the media data (or subsets of it) at this point in the history (e.g., as measured by change iterations) of the media. According to aspects of the invention, the block extension 924 includes important (e.g., primary) subsets metadata 928 and a box of prescriptive, replicable instructions 930 detailing changes made between the version of the media data represented by the previous block(s) and the version of the media data represented by the current block.

Now with reference to FIG. 10A, aspects of an exemplary blocktree 1002 structure will be described. In an embodiment, the blocktree 1002 is an original media file containing one (e.g., genesis) block 0x79b4.

Now with reference to FIG. 10B, aspects of an exemplary blocktree 1004 structure with a single branch of dependencies will be described. According to aspects of the invention, the blocktree 1004 represents media blocks 0x8bb2, 0x0b78, 0x12d8, 0xfe95 representing a single history.

Now with reference to FIG. 10B, aspects of an exemplary blocktree 1006 with various forms of dependencies, in which arrows point to the immediate block dependencies. According to aspects of the invention, the blocktree includes three origin blocks 0xfd45, 0x48f3, 0x5535. In an embodiment, block 0x2135 has a single one immediate dependency 0xfd45. In an embodiment, 0xaa4b has three immediate dependencies 0x2135, 0x48f3, 0x5535. In an embodiment, 0x0b0b0 has two immediate dependencies. According to aspects of the invention, including a linear descendent (not shown) of 0xaa4b, and 0x5535. It is noted that although 0xaa4b also has 0x5535 as an immediate dependency, 0x0b0b0 could also have 0x5535 as an immediate dependency. For ease of reference, the reference “0x” as used herein is a schematic representation of blocks in which that reference is found.

It is noted that the term capture device output as used herein includes sensor data. It is also noted that the term master file as used herein includes a media file following the format shown in FIG. 3 and which is the direct result of a capture device sensor recording reality through the previously described methods.

The term reference file as used herein includes a media file that is not intended for distribution and which uses a file format shown in FIG. 5 . This format may include change logs of varying formats or no change logs. A reference media file is distinct from a master media file because it has undergone alterations according to the previously described methods.

The term distributable media file includes a media file that is intended for distribution to end recipients. Distributable media files use a format shown on FIG. 5 . It is noted that a distributable media file in which the media data has not undergone any changes (and thus, the blocktree only contains the genesis block) is substantially the same as a master media file. It is also noted that if metadata about the file is not considered to be essential (and thus its hashes are not included in the blocktree), metadata in a distributable media file may vary from that in an original media file. The term change log includes replicable instructions on how to modify a previous version of media data into the current version of the media data (including, for example, how to increment the media data primary subset from the master file media data primary subset).

Regarding the flowcharts and block diagrams, the flowchart and block diagrams in the Figures of the present disclosure illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the Figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts or carry out combinations of special purpose hardware and computer instructions.

Referring to FIG. 13 , a system or computer environment 1000 includes a computer diagram 1010 shown in the form of a generic computing device. The method 100, for example, may be embodied in a program 1060, including program instructions, embodied on a computer readable storage device, or computer readable storage medium, for example, generally referred to as memory 1030 and more specifically, computer readable storage medium 1050. Such memory and/or computer readable storage media includes non-volatile memory or non-volatile storage. For example, memory 1030 can include storage media 1034 such as RAM (Random Access Memory) or ROM (Read Only Memory), and cache memory 1038. The program 1060 is executable by the processor 1020 of the computer system 1010 (to execute program steps, code, or program code). Additional data storage may also be embodied as a database 1110 which includes data 1114. The computer system 1010 and the program 1060 are generic representations of a computer and program that may be local to a user, or provided as a remote service (for example, as a cloud based service), and may be provided in further examples, using a website accessible using the communications network 1200 (e.g., interacting with a network, the Internet, or cloud services). It is understood that the computer system 1010 also generically represents herein a computer device or a computer included in a device, such as a laptop or desktop computer, etc., or one or more servers, alone or as part of a datacenter. The computer system can include a network adapter/interface 1026, and an input/output (I/O) interface(s) 1022. The I/O interface 1022 allows for input and output of data with an external device 1074 that may be connected to the computer system. The network adapter/interface 1026 may provide communications between the computer system a network generically shown as the communications network 1200.

The computer 1010 may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, and so on that perform particular tasks or implement particular abstract data types. The method steps and system components and techniques may be embodied in modules of the program 1060 for performing the tasks of each of the steps of the method and system. The modules are generically represented in the figure as program modules 1064. The program 1060 and program modules 1064 can execute specific steps, routines, sub-routines, instructions or code, of the program.

The method of the present disclosure can be run locally on a device such as a mobile device, or can be run a service, for instance, on the server 1100 which may be remote and can be accessed using the communications network 1200. The program or executable instructions may also be offered as a service by a provider. The computer 1010 may be practiced in a distributed cloud computing environment where tasks are performed by remote processing devices that are linked through a communications network 1200. In a distributed cloud computing environment, program modules may be located in both local and remote computer system storage media including memory storage devices.

The computer 1010 can include a variety of computer readable media. Such media may be any available media that is accessible by the computer 1010 (e.g., computer system, or server), and can include both volatile and non-volatile media, as well as, removable and non-removable media. Computer memory 1030 can include additional computer readable media in the form of volatile memory, such as random access memory (RAM) 1034, and/or cache memory 1038. The computer 1010 may further include other removable/non-removable, volatile/non-volatile computer storage media, in one example, portable computer readable storage media 1072. In one embodiment, the computer readable storage medium 1050 can be provided for reading from and writing to a non-removable, non-volatile magnetic media. The computer readable storage medium 1050 can be embodied, for example, as a hard drive. Additional memory and data storage can be provided, for example, as the storage system 1110 (e.g., a database) for storing data 1114 and communicating with the processing unit 1020. The database can be stored on or be part of a server 1100. Although not shown, a magnetic disk drive for reading from and writing to a removable, non-volatile magnetic disk (e.g., a “floppy disk”), and an optical disk drive for reading from or writing to a removable, non-volatile optical disk such as a CD-ROM, DVD-ROM or other optical media can be provided. In such instances, each can be connected to bus 1014 by one or more data media interfaces. As will be further depicted and described below, memory 1030 may include at least one program product which can include one or more program modules that are configured to carry out the functions of embodiments of the present invention.

The method(s) described in the present disclosure, for example, may be embodied in one or more computer programs, generically referred to as a program 1060 and can be stored in memory 1030 in the computer readable storage medium 1050. The program 1060 can include program modules 1064. The program modules 1064 can generally carry out functions and/or methodologies of embodiments of the invention as described herein. The one or more programs 1060 are stored in memory 1030 and are executable by the processing unit 1020. By way of example, the memory 1030 may store an operating system 1052, one or more application programs 1054, other program modules, and program data on the computer readable storage medium 1050. It is understood that the program 1060, and the operating system 1052 and the application program(s) 1054 stored on the computer readable storage medium 1050 are similarly executable by the processing unit 1020. It is also understood that the application 1054 and program(s) 1060 are shown generically, and can include all of, or be part of, one or more applications and program discussed in the present disclosure, or vice versa, that is, the application 1054 and program 1060 can be all or part of one or more applications or programs which are discussed in the present disclosure. It is also understood that the control system 70 (shown in FIG. 8 ) can include all or part of the computer system 1010 and its components, and/or the control system can communicate with all or part of the computer system 1010 and its components as a remote computer system, to achieve the control system functions described in the present disclosure. It is also understood that the one or more communication devices 110 shown in FIG. 1 similarly can include all or part of the computer system 1010 and its components, and/or the communication devices can communicate with all or part of the computer system 1010 and its components as a remote computer system, to achieve the computer functions described in the present disclosure.

One or more programs can be stored in one or more computer readable storage media such that a program is embodied and/or encoded in a computer readable storage medium. In one example, the stored program can include program instructions for execution by a processor, or a computer system having a processor, to perform a method or cause the computer system to perform one or more functions.

The computer 1010 may also communicate with one or more external devices 1074 such as a keyboard, a pointing device, a display 1080, etc.; one or more devices that enable a user to interact with the computer 1010; and/or any devices (e.g., network card, modem, etc.) that enables the computer 1010 to communicate with one or more other computing devices. Such communication can occur via the Input/Output (I/O) interfaces 1022. Still yet, the computer 1010 can communicate with one or more networks 1200 such as a local area network (LAN), a general wide area network (WAN), and/or a public network (e.g., the Internet) via network adapter/interface 1026. As depicted, network adapter 1026 communicates with the other components of the computer 1010 via bus 1014. It should be understood that although not shown, other hardware and/or software components could be used in conjunction with the computer 1010. Examples, include, but are not limited to: microcode, device drivers 1024, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data archival storage systems, etc.

It is understood that a computer or a program running on the computer 1010 may communicate with a server, embodied as the server 1100, via one or more communications networks, embodied as the communications network 1200. The communications network 1200 may include transmission media and network links which include, for example, wireless, wired, or optical fiber, and routers, firewalls, switches, and gateway computers. The communications network may include connections, such as wire, wireless communication links, or fiber optic cables. A communications network may represent a worldwide collection of networks and gateways, such as the Internet, that use various protocols to communicate with one another, such as Lightweight Directory Access Protocol (LDAP), Transport Control Protocol/Internet Protocol (TCP/IP), Hypertext Transport Protocol (HTTP), Wireless Application Protocol (WAP), etc. A network may also include a number of different types of networks, such as, for example, an intranet, a local area network (LAN), or a wide area network (WAN).

In one example, a computer can use a network which may access a website on the Web (World Wide Web) using the Internet. In one embodiment, a computer 1010, including a mobile device, can use a communications system or network 1200 which can include the Internet, or a public switched telephone network (PSTN) for example, a cellular network. The PSTN may include telephone lines, fiber optic cables, transmission links, cellular networks, and communications satellites. The Internet may facilitate numerous searching and texting techniques, for example, using a cell phone or laptop computer to send queries to search engines via text messages (SMS), Multimedia Messaging Service (MMS) (related to SMS), email, or a web browser. The search engine can retrieve search results, that is, links to websites, documents, or other downloadable data that correspond to the query, and similarly, provide the search results to the user via the device as, for example, a web page of search results.

The present invention may be a system, a method, and/or a computer program product at any possible technical detail level of integration. The computer program product may include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present invention.

The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. A non-exhaustive list of more specific examples of the computer readable storage medium includes the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon, and any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

Computer readable program instructions described herein can be downloaded to respective computing/processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and/or a wireless network. The network may comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. A network adapter card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing/processing device.

Computer readable program instructions for carrying out operations of the present invention may be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, configuration data for integrated circuitry, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++, or the like, and procedural programming languages, such as the “C” programming language or similar programming languages. The computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGA), or programmable logic arrays (PLA) may execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present invention.

Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer readable program instructions.

These computer readable program instructions may be provided to a processor of a computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, a programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable storage medium having instructions stored therein comprises an article of manufacture including instructions which implement aspects of the function/act specified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable apparatus, or other device implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the Figures. For example, two blocks shown in succession may, in fact, be accomplished as one step, executed concurrently, substantially concurrently, in a partially or wholly temporally overlapping manner, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts or carry out combinations of special purpose hardware and computer instructions.

It is to be understood that although this disclosure includes a detailed description on cloud computing, implementation of the teachings recited herein are not limited to a cloud computing environment. Rather, embodiments of the present invention are capable of being implemented in conjunction with any other type of computing environment now known or later developed.

Cloud computing is a model of service delivery for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, network bandwidth, servers, processing, memory, storage, applications, virtual machines, and services) that can be rapidly provisioned and released with minimal management effort or interaction with a provider of the service. This cloud model may include at least five characteristics, at least three service models, and at least four deployment models.

Characteristics are as follows:

On-demand self-service: a cloud consumer can unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with the service's provider.

Broad network access: capabilities are available over a network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms (e.g., mobile phones, laptops, and PDAs).

Resource pooling: the provider's computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources dynamically assigned and reassigned according to demand. There is a sense of location independence in that the consumer generally has no control or knowledge over the exact location of the provided resources but may be able to specify location at a higher level of abstraction (e.g., country, state, or datacenter).

Rapid elasticity: capabilities can be rapidly and elastically provisioned, in some cases automatically, to quickly scale out and rapidly released to quickly scale in. To the consumer, the capabilities available for provisioning often appear to be unlimited and can be purchased in any quantity at any time.

Measured service: cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, and active user accounts). Resource usage can be monitored, controlled, and reported, providing transparency for both the provider and consumer of the utilized service.

Service Models are as follows:

Software as a Service (SaaS): the capability provided to the consumer is to use the provider's applications running on a cloud infrastructure. The applications are accessible from various client devices through a thin client interface such as a web browser (e.g., web-based e-mail). The consumer does not manage or control the underlying cloud infrastructure including network, servers, operating systems, storage, or even individual application capabilities, with the possible exception of limited user-specific application configuration settings.

Platform as a Service (PaaS): the capability provided to the consumer is to deploy onto the cloud infrastructure consumer-created or acquired applications created using programming languages and tools supported by the provider. The consumer does not manage or control the underlying cloud infrastructure including networks, servers, operating systems, or storage, but has control over the deployed applications and possibly application hosting environment configurations.

Infrastructure as a Service (IaaS): the capability provided to the consumer is to provision processing, storage, networks, and other fundamental computing resources where the consumer is able to deploy and run arbitrary software, which can include operating systems and applications. The consumer does not manage or control the underlying cloud infrastructure but has control over operating systems, storage, deployed applications, and possibly limited control of select networking components (e.g., host firewalls).

Deployment Models are as follows:

Private cloud: the cloud infrastructure is operated solely for an organization. It may be managed by the organization or a third party and may exist on-premises or off-premises.

Community cloud: the cloud infrastructure is shared by several organizations and supports a specific community that has shared concerns (e.g., mission, security requirements, policy, and compliance considerations). It may be managed by the organizations or a third party and may exist on-premises or off-premises.

Public cloud: the cloud infrastructure is made available to the general public or a large industry group and is owned by an organization selling cloud services.

Hybrid cloud: the cloud infrastructure is a composition of two or more clouds (private, community, or public) that remain unique entities but are bound together by standardized or proprietary technology that enables data and application portability (e.g., cloud bursting for load-balancing between clouds).

A cloud computing environment is service oriented with a focus on statelessness, low coupling, modularity, and semantic interoperability. At the heart of cloud computing is an infrastructure that includes a network of interconnected nodes.

Referring now to FIG. 12 , illustrative cloud computing environment 2050 is depicted. As shown, cloud computing environment 2050 includes one or more cloud computing nodes 2010 with which local computing devices used by cloud consumers, such as, for example, personal digital assistant (PDA) or cellular telephone 2054A, desktop computer 2054B, laptop computer 2054C, and/or automobile computer system 2054N may communicate. Nodes 2010 may communicate with one another. They may be grouped (not shown) physically or virtually, in one or more networks, such as Private, Community, Public, or Hybrid clouds as described hereinabove, or a combination thereof. This allows cloud computing environment 2050 to offer infrastructure, platforms and/or software as services for which a cloud consumer does not need to maintain resources on a local computing device. It is understood that the types of computing devices 2054A-N shown in FIG. 12 are intended to be illustrative only and that computing nodes 2010 and cloud computing environment 2050 can communicate with any type of computerized device over any type of network and/or network addressable connection (e.g., using a web browser).

Referring now to FIG. 13 , a set of functional abstraction layers provided by cloud computing environment 2050 (FIG. 12 ) is shown. It should be understood in advance that the components, layers, and functions shown in FIG. 13 are intended to be illustrative only and embodiments of the invention are not limited thereto. As depicted, the following layers and corresponding functions are provided:

Hardware and software layer 2060 includes hardware and software components. Examples of hardware components include: mainframes 2061; RISC (Reduced Instruction Set Computer) architecture based servers 2062; servers 2063; blade servers 2064; storage devices 2065; and networks and networking components 2066. In some embodiments, software components include network application server software 2067 and database software 2068.

Virtualization layer 2070 provides an abstraction layer from which the following examples of virtual entities may be provided: virtual servers 2071; virtual storage 2072; virtual networks 2073, including virtual private networks; virtual applications and operating systems 2074; and virtual clients 2075.

In one example, management layer 2080 may provide the functions described below. Resource provisioning 2081 provides dynamic procurement of computing resources and other resources that are utilized to perform tasks within the cloud computing environment. Metering and Pricing 2082 provide cost tracking as resources are utilized within the cloud computing environment, and billing or invoicing for consumption of these resources. In one example, these resources may include application software licenses. Security provides identity verification for cloud consumers and tasks, as well as protection for data and other resources. User portal 2083 provides access to the cloud computing environment for consumers and system administrators. Service level management 2084 provides cloud computing resource allocation and management such that required service levels are met. Service Level Agreement (SLA) planning and fulfillment 2085 provide pre-arrangement for, and procurement of, cloud computing resources for which a future requirement is anticipated in accordance with an SLA.

Workloads layer 2090 provides examples of functionality for which the cloud computing environment may be utilized. Examples of workloads and functions which may be provided from this layer include: mapping and navigation 2091; software development and lifecycle management 2092; virtual classroom education delivery 2093; data analytics processing 2094; transaction processing 2095; and storing and verifying changes made to as-captured sensor device media data 2096.

The descriptions of the various embodiments of the present invention have been presented for purposes of illustration, but are not intended to be exhaustive or limited to the embodiments disclosed. Likewise, examples of features or functionality of the embodiments of the disclosure described herein, whether used in the description of a particular embodiment, or listed as examples, are not intended to limit the embodiments of the disclosure described herein, or limit the disclosure to the examples described herein. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen to best explain the principles of the embodiments, the practical application or technical improvement over technologies found in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. 

What is claimed is:
 1. A computer-implemented method comprising: receiving, by a computer, a capture device output, the output representing an aspect of a recorded event; cryptographically processing, by the computer, the capture device output to produce a validatable master file, the master file including at least one primary subset; wherein the validatable master file includes a master file media data primary subset from the capture device output, master metadata, and master file blocktree data; and wherein the master file blocktree data includes a master file block history portion, a master file signature key portion, and a signed hash of the master file media data primary subset.
 2. The computer-implemented method of claim 1, wherein the cryptographic processing includes: dividing the media data, by the computer, into at least one tracked data subset corresponding to the primary subset; generating, by the computer, a hash of the at least one tracked data subset; generating, by the computer, metadata of the hash of the at least one tracked data subset; combining, by the computer, the hash and the metadata of the hash into at least one tracked data packet; and cryptographically signing, by the computer, the at least one data packet.
 3. The computer-implemented method of claim 1, further including: modifying, by the computer, the master file media data primary subset to produce a reference file media data primary subset; preparing, by the computer, a reference file including the reference file media data primary subset, reference file metadata, and reference file blocktree data; wherein the reference file blocktree data includes the master file blocktree data and blocktree incrementing information, wherein the blocktree incrementing information includes a hash of the master file blocktree data, reference file blocktree metadata, a signed hash of primary subset metadata, a signed hash of a change log incrementing the media data primary subset from the master file media data primary subset, and a signed hash of the reference file media data primary subset.
 4. The computer-implemented method of claim 3, wherein the reference file further includes instructions indicating replicable changes made, by the computer, between the modified primary subset media and the master file media data primary subset.
 5. The computer-implemented method of claim 1, further including: receiving, by the computer, a challenged master file identified as a copy of the validatable master file; receiving, by the computer, a request to validate the challenged master file; and executing, by the computer, a master file validation routine to assess validity of the challenged master file; wherein the master file validation routine includes hashing, by the computer, media data primary subset of the challenged master file to generate a hashed challenged master file media data primary subset; unsigning, by the computer, a signed hash portion of the media data primary subset of the challenged master file to generate an unsigned challenged master file media data primary subset; and determining, by the computer, whether the hashed challenged master file media data primary subset and the unsigned challenged master file media data primary subset match.
 6. The computer-implemented method of claim 3, further comprising: receiving, by the computer, a reference file identified as a modified version of the master file; receiving, by the computer, a request to determine whether the reference file is a modified version of the master file; and executing, by the computer, a reference file verification routine; wherein the reference file verification routine includes determining, by the computer, whether the hash of the master file blocktree data and a hash of blocktree data of the reference file match; and applying, by the computer, changes indicated by the blocktree incrementing information to a media data primary subset in the reference file to generate a hashed reference file media data primary subset and unsigning reference file blocktree data to generate unsigned reference file blocktree data; and determining, by the computer, whether the hashed reference file media data primary subset and the unsigned reference file blocktree data match.
 7. The computer-implemented method of claim 6, further comprising: receiving, by the computer, a reference file identified as an authentic modification of the master file; receiving, by the computer, a distributable file; receiving, by the computer, a request to determine whether the distributable file is an authentic modification of the reference file identified as an authentic modification of the master file; and executing, by the computer, a distributable file verification routine; wherein the distributable file verification routine includes determining whether a hash of distributable file blocktree data matches a hash of the reference file blocktree data and whether a hash of a distributable file media data primary subset matches a corresponding unsigned hash of a representative media block.
 8. A system which comprises: a computer system comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to: receive a capture device output, the output representing an aspect of a recorded event; cryptographically process, the capture device output to produce a validatable master file, the master file including at least one primary subset; wherein the validatable master file includes a master file media data primary subset from the capture device output, master metadata, and master file blocktree data; and wherein the master file blocktree data includes a master file block history portion, a master file signature key portion, and a signed hash of the master file media data primary subset.
 9. The system of claim 8, wherein the instructions to cryptographically process further cause the computer to: divide the media data into at least one tracked data subset corresponding to the primary subset; generate a hash of the at least one tracked data subset; generate metadata of the hash of the at least one tracked data subset; combine the hash and the metadata of the hash into at least one tracked data packet; and cryptographically sign the at least one data packet.
 10. The system of claim 8, further including instructions causing the computer to: modify the master file media data primary subset to produce a reference file media data primary subset; prepare a reference file including the reference file media data primary subset, reference file metadata, and reference file blocktree data; wherein the reference file blocktree data includes the master file blocktree data and blocktree incrementing information, wherein the blocktree incrementing information includes a hash of the master file blocktree data, reference file blocktree metadata, a signed hash of primary subset metadata, a signed hash of a change log incrementing the media data primary subset from the master file media data primary subset, and a signed hash of the reference file media data primary subset.
 11. The system of claim 10, wherein the reference file further includes instructions indicating replicable changes made, by the computer, between the modified primary subset media and the master file media data primary subset.
 12. The system of claim 8, further including instructions causing the computer to: receive a challenged master file identified as a copy of the validatable master file; receive a request to validate the challenged master file; and execute a master file validation routine to assess validity of the challenged master file; wherein the instructions master file validation routine includes directions further causing the computer to hash media data primary subset of the challenged master file to generate a hashed challenged master file media data primary subset; unsign a signed hash portion of the media data primary subset of the challenged master file to generate an unsigned challenged master file media data primary subset; and determine whether the hashed challenged master file media data primary subset and the unsigned challenged master file media data primary subset match.
 13. The system of claim 10, further comprising instructions causing the computer to: receive a reference file identified as a modified version of the master file; receive a request to determine whether the reference file is a modified version of the master file; and execute a reference file verification routine; wherein the reference file verification routine includes instructions further causing the computer to determine whether the hash of the master file blocktree data and a hash of blocktree data of the reference file match; and apply changes indicated by the blocktree incrementing information to a media data primary subset in the reference file to generate a hashed reference file media data primary subset and unsigning reference file blocktree data to generate unsigned reference file blocktree data; and determine whether the hashed reference file media data primary subset and the unsigned reference file blocktree data match.
 14. The system of claim 13, further comprising instructions further causing the computer to: receive a reference file identified as an authentic modification of the master file; receive a distributable file; receive a request to determine whether the distributable file is an authentic modification of the reference file identified as an authentic modification of the master file; and execute a distributable file verification routine; wherein the distributable file verification routine includes instructions causing the computer to determine whether a hash of distributable file blocktree data matches a hash of the reference file blocktree data and whether a hash of a distributable file media data primary subset matches a corresponding unsigned hash of a representative media block.
 15. A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to: receive, using the computer, a capture device output, the output representing an aspect of a recorded event; cryptographically process, using the computer, the capture device output to produce a validatable master file, the master file including at least one primary subset; wherein the validatable master file includes a master file media data primary subset from the capture device output, master metadata, and master file blocktree data; and wherein the master file blocktree data includes a master file block history portion, a master file signature key portion, and a signed hash of the master file media data primary subset.
 16. The computer program product of claim 15, wherein the instructions to cryptographically process further cause the computer to: divide, using the computer, the media data into at least one tracked data subset corresponding to the primary subset; generate, using the computer, a hash of the at least one tracked data subset; generate, using the computer, metadata of the hash of the at least one tracked data subset; combine, using the computer, the hash and the metadata of the hash into at least one tracked data packet; and cryptographically sign, using the computer, the at least one data packet.
 17. The computer program product of claim 15, further including instructions causing the computer to: modify, using the computer, the master file media data primary subset to produce a reference file media data primary subset; prepare, using the computer, a reference file including the reference file media data primary subset, reference file metadata, and reference file blocktree data; wherein the reference file blocktree data includes the master file blocktree data and blocktree incrementing information, wherein the blocktree incrementing information includes a hash of the master file blocktree data, reference file blocktree metadata, a signed hash of primary subset metadata, a signed hash of a change log incrementing the media data primary subset from the master file media data primary subset, and a signed hash of the reference file media data primary subset.
 18. The computer program product of claim 15, further including instructions causing the computer to: receive, using the computer, a challenged master file identified as a copy of the validatable master file; receive, using the computer, a request to validate the challenged master file; and execute, using the computer, a master file validation routine to assess validity of the challenged master file; wherein the instructions master file validation routine includes directions further causing the computer to hash, using the computer, media data primary subset of the challenged master file to generate a hashed challenged master file media data primary subset; unsign, using the computer, a signed hash portion of the media data primary subset of the challenged master file to generate an unsigned challenged master file media data primary subset; and determine, using the computer, whether the hashed challenged master file media data primary subset and the unsigned challenged master file media data primary subset match.
 19. The computer program product of claim 17, further comprising instructions causing the computer to: receive, using the computer, a reference file identified as a modified version of the master file; receive, using the computer, a request to determine whether the reference file is a modified version of the master file; and execute, using the computer, a reference file verification routine; wherein the reference file verification routine includes instructions further causing the computer to determine, using the computer, whether the hash of the master file blocktree data and a hash of blocktree data of the reference file match; and apply, using the computer, changes indicated by the blocktree incrementing information to a media data primary subset in the reference file to generate a hashed reference file media data primary subset and unsign, using the computer, reference file blocktree data to generate unsigned reference file blocktree data; and determine, using the computer, whether the hashed reference file media data primary subset and the unsigned reference file blocktree data match.
 20. The computer program product of claim 19, further comprising instructions further causing the computer: receive, using the computer, a reference file identified as an authentic modification of the master file; receive, using the computer, a distributable file; receive, using the computer, a request to determine whether the distributable file is an authentic modification of the reference file identified as an authentic modification of the master file; and executing, using the computer, a distributable file verification routine; wherein the distributable file verification routine includes instructions causing the computer to determine whether a hash of distributable file blocktree data matches a hash of the reference file blocktree data and whether a hash of a distributable file media data primary subset matches a corresponding unsigned hash of a representative media block. 